Add Yeast, Warm Water, Sugar, & Salt into a large mixing bowl. Let foam & bubble for 10 minutes. Add EVOO and 2 1/2 cups flour. Let dough work and if too sticky add remaining 1/2 cup of flour.
Let dough work on dough hook for 8 minutes. Then place the dough in an oiled bowl and cover. Let rise 1 1/2 - 2 Hours.
Split dough into half. Roll into shape of Stromboli & flatten. Fill dough with fillings and then pinch closed on one side. Whisk 1 egg yolk and brush on top of each Stromboli. Cut slices in the dough for venting. Cook in oven at 450 for 10-12 minutes.
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